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Finding the Fourth Proportional to 1,177.92, 1,624 and 784.64

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Solution

The fourth proportional to 1,177.92, 1,624 and 784.64 is: 1,081.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,177.92 : 1,624 = 784.64 : x
  2. Step 2: Convert to fraction form
    1,177.92/1,624 = 784.64/x
  3. Step 3: Cross multiply
    1,177.92x = 1,624 × 784.64
  4. Step 4: Simplify right side
    1,177.92x = 1,274,255.36
  5. Step 5: Solve for x
    x = 1,274,255.36/1,177.92
  6. Step 6: Final answer
    x = 1,081.78

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.